Handle linking_successful message (that i just wrote)

cmd/signald-cli/cmd/link.go

@@ -58,6 +58,14 @@ var linkCmd = &cobra.Command{
 					} else {
 						qrterminal.Generate(message.Data.URI, qrterminal.M, os.Stdout)
 					}
+					break
+
+				case "linking_successful":
+					if !uriOrQR {
+						fmt.Println("Successfully linked")
+						os.Exit(0)
+					}
+					break
 				}
 			}
 		}